Assignment 6, Due: Friday, Thursday, December
• Submit your calculation electronically through Black Board.
Read the entire section 29.4 in the textbook
2 Solve this problem:
A non-stratified lake has a surface area of 19.8km2. The volume of the lake is
3.5 × 108m3, the flow into the lake is 2.03 × 108m3/yr and the active sediment
thickness is 10 cm. The loading of phosphorus into the lake is 7 × 108mg/yr.
If the settling velocity of phosphorus is 10m/yr and the P resuspension rate is
• Calculate the steady state concentration of P in the lake.
• If the current concentration of P in the lake (water column) is 20mg/m3,
and in the active sediment layer is 30mg/m3, how long does it take for it
to within 10% range of the equilibrium concentration.
* Hint to answer the second part of the problem you should solve Eqs.
(29.31 and 29.32) numerically using the techniques you have used for solving kinetics of pollutants in CSTR systems (you can use either an explicit
or an implicit Euler’s method).
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